[jmauld]

That's going to also depend on the tire you're running. You really can't look at one component by itself. You need to look at what you want out of the car, and then build the overall system around it.

If you are building this for street use, then I would suggest sticking with softer springs and stiffer swaybars. If you're autocrossing it, then start taking tire temps and measuring your spring travel after each run. Those two things will tell you more than anyone else can.

For a reference, I have no rear swaybar, yet no one who drives it complains that my car understeers too much. The thing is that, you just can't use that information and blindly apply it to your car. You would also need to know my camber settings, springrates and tire choice for that to be at all useful.